00:01
So for the first one is take note that experimental value of enthalpy of reaction can higher than theoretical value in this following cases.
00:10
First one is we have the actual, it could be the actual masses or volumes of species that involve is more than noted.
00:29
Second one, the final temperature recorded is more than actual.
00:46
This will increase the heat gain by water and will result in higher calculated value of enthalpy of reaction.
00:55
Second, experimental value of enthalpy of reaction can lower than theoretical value in the following cases.
01:04
It could be first one we have also the actual again this is also the actual masses we have the actual masses or volumes of species that is involved so it is involved let me delete this one we have in fold is less than so it is less than noted is less than noted this will lead to less heat evolve or absorbed second one is we have the final temperature the final temperature recorded is less than actual temperature temperature temperature of what that would be your water which is more is more than actual this will decrease the heat gain by water and will result in lower calculated value of antel fee of reaction another thing is that the cup used the cup used was not it is not well insulated and also the heat was lost to surroundings for number three we need to get basically here the heat loss by hot water and again we have the specific heat capacity of your water that is 4 .18 joules per gram per kelvin and now to find the heat loss by hot water we have this formula that is negative heat, heat gained by cold water, plus heat gained by calorimeter.
04:09
So we have here the change in temperature for cold water as well as color meter.
04:16
We have 39 minus 22 .1.
04:19
That would be 17 .0 degrees celsius or 17 .0 kelvin.
04:24
We have also the heat gained, heat gained by water, which is equals to 25 .00 grams times 4 .18 joules per gram kelvin times 17 .0 kelvin.
04:47
So we have 1 ,765 or 1 ,776 .5 joules.
04:56
Now we need to get our heat gain by color meter and basically here we have to get the heat capacity of your color meter.
05:13
And to get the heat capacity of your color meter, so we have heat capacity of colorimeter...